Support for electric food mixers or the like



Nov. 7, 1950 R. s. WALLACH r-:T Al. 2,529,120

SUPPORT FOR ELECTRIC FOOD MIXERS OR THE LIKE Filed Dec. 19, 1946 4 Sheets-Sheet 1 ATTORNEYS Nov. 7, 1950 R. s. wALLAcH ETAL 2,529,120

SUPPORT FOR ELECTRIC FOOD MIXERS 0R THE LIKE Filed Dec. 19, 1946 4 Sheets-Sheet 2 INVENToRs ATTORNEYS Nov. 7, 1950 R. S. WALLACH ETAL Filed Dec. 19, 1946 lHllHliii 4 shets-sheet 5 ATTORNEYS Nov. 7, 1950 R. s. wALLAcH ETAL SUPPORT FOR ELECTRIC FOOD MIXERS 0R THE LIKE Filed Dec. 19, 194e 4 Sheets-Sheet 4 flToR/VEYS Patented Nov. 7, 1950 SUPPORT FOR ELECTRIC FOOD MHXERS 0R THE LIKE Robert S. Wallach, Madison, N. J., and Irving D. Wallach, Port Washington, N. Y., assignors to Associated Development &.Research Corporation, New York, N. Y., a corporation of New York Application December 19, 1945, Serial No. 717,294

This invention relates to a domestic appliance for the operation of power driven tools such as food mixersy fruit juicers, sharpening and builing wheels-and the like, and has for a principal object to provide an improved and conveniently used assembly which includes an electric motor, an improved clutch-provided tool mount which may be optionally held in the hand or adjustably affixed to. a support during the use of the appliance, and flexible shaft means mechanically connecting the motor and the tool mount.

It is another object of the invention to provide a tool handle for such an appliance, which includes an improved clutch by means of which the operation of the mixers or the other tools may be controlled independently of the motor switch.

`It is an object of the invention to provide a tool handle by: means of which a `power driven tool may be conveniently held, said handle having an improved clutch with which to connect or disconnect the tool with the power source by iinger pressure on an externally accessible finger piece.

It is an additional object of the invention to provide a clutch provided tool mount for a motor driven tool; the cooperating clutch parts being so arranged that when the motor is idling it is subjectedto a minimum of frictional drag.

Further objects are to provide a tool mount for a power driven tool having a clutch assembly which, when the clutch is disengaged, introduces a positive braking action to stop the rotation of the tool with minimum of overrun and in which a single beater tool, or multiple beater tools, may be employed according to the preference of the user or the requirements of the work being done.

Other features and advantages of the invention will hereinafter appear from the following detailed description of a preferred embodiment of the invention.

In the accompanying drawings:

Fig. l is a side elevation partly in section, showing a complete device pursuant to the present invention, said device being set up for use as a mixer or beater;

Fig. 2 is a detail, partly in section, of the swivel mount for attaching the motor to a supporting arm;

Fig. 3 is a vertical elevation, in central section, of the tool mount, said mount having attached thereto a mixer or beater;

Fig. 4 is a plan section taken on lines 4 4 of Fig. 3;

Fig. 5 is a vertical elevation, in section, showing a tool mount to which has been attached aux- 2 Claims. (Cl. 248-121) iliary beaters for cooperation with a central power driven beater;

Fig. 6 is a transverse sectional view taken along lines 6-6 of Fig. 3;

liig. 7 is a section through the beater heads, looking in the direction of the lines "l-l oi" Fig. 5;

8 is a vertical elevation, partly in section,

Vof the apparatus when used as a fruit juicer; and

Fig. 9 isv a front elevation, taken in section through a reamer to illustrate the means whereby the bowl of the fruit juicer is supported upon the tool mount.

Referring to the drawings, the apparatus includes a motor Hi which is swivelly hung from an extension arm l l adapted to ybe supported by means of the socket l2 to a vertical wall surface M. As is conventional, the motor has a control switch i5 with which preferably is associated the usual rheostat (not shown) by means of which motor speeds may be controlled. As is well known, different motor speeds are employed for beating, whipping, fruit juicing, and other domestic tasks and it is intended that a dial or the like shall be placed concentric with the switch l5 so as to guide the user in the selection of the proper operv ating speed.

The motor may be swivelly hung by means of arsaddle It secured to the end of the arm Il so as to permit it to swing thereon, said saddle I6 securing a pivoted stud Il which rotatably engages a strap I8 aixed to the motor casing.

A tool mount 20 is drivingly associated with the motor by means of a flexible drive shaft 2i, said drive shaft being secured respectively to the motor and to the tool mount by means which include the attachment nuts 22, 23.

The tool mount is arranged for detachable association with a stand which includes a support 24. Said support has a head 25 rotatably secured thereon, and said head includes one or more catches 25 which cooperate with apertures formed in the support 2d so as to releasably lock the said head in variant angular positions. Preferably said head 25 is bifurcated to receive a swing arm 2l which is permitted to rotate through it) angular degrees as provided by a slot 28. The end 36 of the swing arm rotatably fits within a socket provided inthe end of the tool mount 2t. As appears in Fig. 1, the tool mount has a detent 3l whereby said mount may be releasably held in one of several positions on the swing arm 2l.

The tool mount may be detached from the stand when desired, as when using a tool such as a pct scourer or when beating or mixing mafterials cooking on a stove, and the mount there- 3 fore includes a handle 29 to be easily held by the user.

Referring now to Fig. 3, it will be seen that the tool mount is hollow, and has, at one end, a clutch housing portion 32. A side Wall of the handle is removable to permit access to the interior for assembly of the component elements. The upper end of the housing 32Vis closed by a plug 33 having threaded sleeve 34 which receives the securement nut 22 of the drive shaft assembly. The plug has an axial aperture through which extends a freely rotatably hollow shaft 35 which terminates in a clutch jaw 36. The shaft has an internal keyway for cooperation with a spline or the like provided on the end of the flexible shaft. Any suitable antifriction bearing 31 may be interposed between the upper face of the clutch jaw 36 and the plug 33. A collar 38, freely rotatable within sleeve 34, is secured to the shaft 35 to limit aXial displacement thereof.

It is preferable that the clutch be of the posi-` tive jaw type, and therefore slidablycarried upon a shaft 4l] is a cooperating clutch member 4I which has jaws to t within slots providedl in the cooperating face of the clutch element 36. Fig. 3 shows the clutch in engaged position.

A pair of cooperating collars 42, 43 which are carried upon the cylindrical neck of the clutch member 4I confine the forked end of a clutch lever 44 therebetween. It will be noted that the shaft has dimetrically opposite splines 45, and pin members 46 extend through the Collar 43 to enter the said splines. The end of the shaft 46 terminates in a socket 41 which Yreceives the end of the tool shaft 48. Desirably` said tool shaft has a spring 56 fixed thereon, said spring snapping within a slot 5I in socket 41 to retain the tool shaft therein. A bushing 52 hasv an upper flange which forms a lower race for a ball bearing 53, the upper race being provided by a collar 54 which may be formed as an integralpart of the shaft 46. The upper surface of said collar 54 is preferably machined smooth for coopera.-

tion with the lower surface of the collar 43 to provide a braking surface when the clutch isV in disengaged position. A coil spring 55 disposed about the collar of clutch member 4| urges the latter toward the clutch element 36 so that the two clutch portions will be brought into mating engagement.

To throw the clutch lever 44 into engaged or disengaged position, there is provided a cam 56 carried by or formed upon a shaft 51 journaled in bearings in the side walls of the handle 29. Said cam has two equal radius arcuate ends 58 and two diametrically opposite parallel flats 59. As the cam is rotated counterclockwise, there will be no movement of lever 44 until a flat 59 comes into position, whereupon said lever will be free to throw the clutch into disengage position. Lever 44 is pivoted on a shaft 60, and an extension 6| of said lever is urged by a coil spring 62 into counterclockwise rotation.

Fixed upon shaft 51 is a disc 63, which has four equi-angularly spaced pins 64 extending therefrom. Said pins cooperate with a spring biased pawl 65 pivotally carried by a fingerpiece 66 formed on the main shaft-lever 61 pivoted internally of the handle,as on the shaft 68. The coil spring 62 ts within a socket 69 in lever 61,

and thus serves both the clutch-throw lever 44.

and the shift lever 61. It is apparent therefore that when the ngerpiece 66 is pressed the pawl 65 will urge the disc 63 into counterclockwise rotation. The mechanical relationship of the pawl and the pins 54 is such that a complete movement of the ngerpiece 66 will effect a 90 degree rotation of the disc, although as later eX- plained, a partial movement of the ngerpiece sets up forces which complete the movement of the disc. To prevent backward rotation of the disc as the iingerpiece 66 returns to original position, there are provided four notches 1I about Vtool.

Afrom the central beater head 85.

the periphery of the disc, and said notches cooperate with a detent 12 pivotally carried upon the shaft 66. To assist in the rotation of the disc 63 and to correctly establish the shifted position thereof, there is provided a lever 13, also pivotally mounted by the shaft 66, and having an arcuate head 14 which ts between adjacent pins 64 as clearly appears in Fig. 3. The conguration of the head is such that when it is in home position, the disc 63 has been rotated precisely 90 degrees. As is shown in Fig. 4, the respective levers 12 and 13 are immediately adjacent, and are formed to have a joint pocket within which a common coil spring 15 is received.

When lever 61 is rotated upwardly, the disc 63 begins its rotation, and coil spring 62 compresses. Lever 13 lifts against the tension of spring 15 because'of the camming effect of the pin 64 against the arcuate head 14. However, lever 44 does not immediately move because of the equi-radial arc 58 then in contact with it. At the overthrow stage, as flat 59 comes into position, springs 62 and 15 have substantial stored energy, and complete the rotation of disc 63 with a snap action. The clutch lever 44 then comes smartly into declutching position.

It will be noted that substantially all of the friction-creating.elements of the clutch members are on the driven side of the clutch. When the cam 56 has been brought to clutch-disengagement position and the clutch jaws have separarated, the clutch member 36 forms the only'load on the then-idling motor, which therefore has a minimum of frictional drag. As the clutch lever 44' throws the clutch assembly downwardly, the surfaces of the collars 43 and 54Y will come into engagement to exert a braking action which will almost immediately halt further rotation of the tool shaft 48. Preferably, the Vdownward movement 'of collar 43 is so related to the ratio of the radius of cam arc 58 to the spacing of at 59 from the center'of cam rotation that the lever lll is supported slightly above the cam hat when the aforesaid braking action occurs, and thus coil spring 62 is effective to press the braking surfaces together to improve the braking action.

Referring-now to Fig. 5, the clutch-housing 32 provides a pair of sockets 86, 8l which are preferably disposed in line with the shaft extension 41 which receives the shaft 48 of the power driven When the tool 4&3 is a beater, as shown in Fig. 5, the sockets 86, 8| may be used tov receive the ends of the shafts S2, 83 of a pair of'idler beaters which are freely rotatable on said shafts and which are rotatably mounted on yoke 84. The respective heads 85, 86, 31 of the beaters' are Yformed from curved strips joined at their upper and. lower ends to suitable collars, as shown. Said strips are preferably ellipsoidal, in that they are curves of constantly changing radius. The central .beater head 85 mechanically meshes with the adjacent heads 86, 81, and it has been found that the ellipsoidal configuration provides the most efficient shape forY driving the idler beaters It has also been found that a center to center relationship of the S major axes of adjacent ellipses to the minor diameter of the respective ellipses should be of the order of from 6U to lll per cent for most efcient operation. For example, in a preferred embodiment of the invention the minor diameter of each ellipse is 1% inches and the major axes of the respective ellipses are 1% inches on centers. The ellipsoidal shape of the beater heads and the spacing ratio above expressed is believed by us to be novel and constitutes an important feature of the present invention.

It will be Iunderstood that although the axes of the respective beater heads are shown in alignment, they may be angularly related, in which event loke 84 would be V-shaped or triangular. Such coniiguration would compact the auxiliary beater assembly.

The tool mount may be swung or rotated on the stand 24 for Iuse with other tools, such asa sharpening wheel, builng wheel or the like. tool mount is swung completely over so that the socket 4T is vertical, a fruit juicer bowl 90 may be placed on the tool mount. The bowl 90 has a sleeve 9| providing an axial aperture and having a flange 92 which secures a pair of short rods 93 which t Within the sockets 8U, 8| in the clutch housing 32 to support the bowl 90. The reamer 94 has a shaft 95 which enters the drive socket 41 for rotation therewith.

Although the invention has been described with particular reference to a domestic appliance, it is obvio-us that it is a useful appliance for any purpose where a light-duty mixing, sanding or grinding machine is needed.

Although the invention has been described by making a fully detailed reference to the certain presently preferred embodiments, such detail of description is to be understood in an instructive rather than a limiting sense, many changes being possible within the scope of the claims hereto appended.

When the We claim:

1. In an apparatus of the character described, a tool mount for a power driven tool comprising a handle having a portable tool-receiving socket, means for driving said socket from an external power source, a support for said tool comprising a standard, a head swivelly mounted thereon, an extension associated with said head and releasably engaging with the handle of said tool, detent means associated with said standard and head and engageable to optionally secure said handle at one of several angular positions about the periphery 0i said standard.

2. In an apparatus of the character described, in combination a standard, an extension rotatably mounted thereon, detent means cooperating with said extension and standard to retain the former in one of several positions to which it may be rotated with respect to the latter, a motor driven tool socket, a handle for supporting said socket, and means for releasably connecting said handle with said extension.

ROBERT S. WALLACH. IRVING D. WALLACH.

REFERENCES CITED The following references are of record in the le of this patent:

UNITED STATES PATENTS Number Name Date 386,105 Bryant June 17, 1888 1,399,296 Feeney Dec. 6, 1921 2,061,868 Fitzgerald 1 Nov. 24,1936 2,103,922 Van Guider Dec. 28, 1937 2,187,636 Story Jan. 16, 1940 2,246,517 Holister June 24, 1941 2,267,424 Roos Dec. 23, 1941 2,372,397 Sheroff Mar. 27, 1945 

